CN112485586A - Power distribution network fault positioning method and equipment based on fault indicator and storage medium - Google Patents
Power distribution network fault positioning method and equipment based on fault indicator and storage medium Download PDFInfo
- Publication number
- CN112485586A CN112485586A CN202011240192.5A CN202011240192A CN112485586A CN 112485586 A CN112485586 A CN 112485586A CN 202011240192 A CN202011240192 A CN 202011240192A CN 112485586 A CN112485586 A CN 112485586A
- Authority
- CN
- China
- Prior art keywords
- fault
- section
- distribution network
- power distribution
- indicator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Locating Faults (AREA)
Abstract
The invention provides a power distribution network fault positioning method, equipment and a storage medium based on a fault indicator, wherein a master station monitors the state of a power distribution network in real time and receives fault information; the main station processes the fault information into current phasor; acquiring a power supply section vector according to the current phasor, and determining a fault area; carrying out inverse operation to obtain fault current phasor under a preset condition; fault location fault tolerance analysis processing; judging whether a fault occurs; if the fault occurs, an alarm prompt is sent out, and a fault area and a fault point are displayed. By adopting the method of digraphization, the line structure is simplified, the incidence matrix is constructed, the fault section is determined by simple multiplication operation, a large amount of complex operation is not needed, and the efficiency is greatly improved.
Description
Technical Field
The invention relates to the technical field of power fault location, in particular to a power distribution network fault location method, equipment and a storage medium based on a fault indicator.
Background
The power system plays an important role in the production and life of human beings at present, and the work of ensuring the safety and reliability of a power supply system is very important. The power system has large network coverage area and wide radiation. If a certain point or a plurality of points have faults, the workload of troubleshooting the faults is large, and the troubleshooting difficulty is high. In order to quickly locate and remove a fault, fault indication equipment is generally adopted to assist in completing line detection.
At present, a plurality of different fault positioning modes exist, but the positioning effect is not ideal based on the condition limitation of the use environment.
For example, a network-based matrix algorithm is used for positioning, and the method cannot adapt to a complex power distribution network system with distributed power access. The matrix algorithm for positioning is only suitable for a single power supply radiation system, but the matrix algorithm has large calculation amount and low efficiency.
Also a matrix algorithm based on a mesh is used for localization. Although the problem of multi-power supply parallel power supply can be solved, the grid-shaped matrix algorithm needs to perform fault location calculation by assuming a positive direction for each power supply.
Although the net-shaped matrix algorithm can accurately position, the net-shaped matrix algorithm has extremely large calculation amount and has high requirements on the processing capacity of the system.
Therefore, the traditional matrix algorithm can be suitable for a complex distributed power grid, but the traditional matrix algorithm does not consider weather reasons such as wind and rain in the actual operation work of the power distribution network and a series of influences such as equipment aging caused by environmental factors, so that the traditional matrix algorithm has larger errors in the actual operation process, and cannot be popularized and used in a wide area.
Therefore, based on the defects of the above modes, how to monitor the operation state of the power distribution network system in real time, and to realize rapid fault location, and to ensure accurate location is a technical problem to be solved urgently at present.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides advanced fault detection equipment for monitoring the running state of the power distribution network system in real time, realizing rapid positioning of a fault section and realizing fault judgment and fault positioning.
The method specifically comprises the following steps:
the master station monitors the state of the power distribution network in real time and receives fault information;
the main station processes the fault information into current phasor;
acquiring a power supply section vector according to the current phasor, and determining a fault area;
carrying out inverse operation to obtain fault current phasor under a preset condition;
fault location fault tolerance analysis processing;
judging whether a fault occurs;
if the fault occurs, an alarm prompt is sent out, and a fault area and a fault point are displayed.
Further, the method comprises the following steps:
configuring a power distribution network in a phase tree form, wherein the current flow direction is a positive direction;
installing a fault indicator at each node, and segmenting the line according to the position of the fault indicator;
when a fault occurs in the circuit, fault current flows between a fault point and a power supply, the fault indicator acts to warn, and the other fault indicators do not act;
the value of the line current through which the fault current flows is defined as 1, and the remaining line current values are defined as 0.
It is further noted that the fault location unit fault location method based on the fault indicator;
the method comprises the steps that 4 fault indicators are preset to divide a line into 4 sections, a section 1 is arranged between a node FI1 and other 3 fault indicators, a section 2 is arranged below a node FI2, a section 3 is arranged below a node FI3, and a section 4 is arranged below a node FI 4;
when a fault occurs after the node FI2, the node FI1 and the node FI2 both act, the current value is 1, the node FI3 and the node FI4 do not act, the current value is 0, and the line current phasor:
ib＝[1 1 0 0]T (1-1)
calculating the inflow current i of each nodecIf the current value is 1, the fault occurs after the point, the lines between the next fault indicator without action are fault sections, and the current values of other lines in normal operation are 0;
obtaining fault section phasor:
ic＝[0 1 0 0]T (1-2)
It is further noted that the fault location method based on fault indicator is a fault location method;
when multiple faults occur in the line, section 3 and section 4 fail, there is a fault current except for section 2, there is an action except for node FI2, and the line fault current phasor:
ib＝[0 1 0 0]T (2-1)
substituting the phasor in the fault section:
ic＝[-1 0 1 1]T (2-2)
the phase-1 in the above equation indicates that the fault current is merged in section 1.
It should be further noted that the fault location fault tolerance analysis process includes:
judging a fault section according to the fault information, then performing inverse operation, returning all numbers greater than or equal to 1, comparing the numbers with the fault information, and analyzing the coincidence degree to reduce the probability of misjudgment;
the fault tolerance method comprises the following steps:
calculating out fault section phasor icDetermining fault section, calculating fault current phasor ib：
ib＝[1 0 0 0 1 1]T (3-1)
ic＝[1 -1 0 0 0 1]T (3-2)
icTwo of 1, then 2n-1-3 fault cases, n being the number of 1;
three fault state conditions are configured: (a) FI1 post fault; (b) FI6 post fault; (b) both occur;
preset fault state phasor ickAt each ickThe element value of the middle fault section is 1, and the others are 0;
when (b) occurs, ic2Comprises the following steps:
ic2＝[0 0 0 0 0 1]T (3-3)
third, according to inverse calculation
Calculate i for all casesckThen i willbkPerforming a return-to-1 process, wherein k is 1, … 2n-1；
ic1Corresponding to ib1Comprises the following steps:
ib1＝[1 0 0 0 0 0]T (3-4)
ic2corresponding to ib2Comprises the following steps:
ib2＝[1 1 0 0 1 1]T (3-5)
ic3corresponding to ib3Comprises the following steps:
ib3＝[1 1 0 0 1 1]T (3-6)
fourthly, mixing ibkAnd reality ibComparing, the higher the similarity is, the higher the possibility is;
defining the similarity s:
s＝ib⊙ibk (3-7)
taking element sum in s as a similarity index, the larger f is, the higher the similarity is:
wherein n is the number of fault indicators;
(a) FI1 post fault; (b) FI6 post fault; (b) the similarity of the three cases in which both occur is:
and judging the fault section according to the formula (3-9).
The invention also provides a device for realizing the power distribution network fault positioning method based on the fault indicator, which comprises the following steps:
the storage is used for storing a computer program and a power distribution network fault positioning method based on the fault indicator;
and the processor is used for executing the computer program and the power distribution network fault location method based on the fault indicator so as to realize the steps of the power distribution network fault location method based on the fault indicator.
The invention also provides a storage medium with the fault indicator-based power distribution network fault location method, and the storage medium stores a computer program which is executed by a processor to realize the steps of the fault indicator-based power distribution network fault location method.
According to the technical scheme, the invention has the following advantages:
according to the power distribution network fault positioning method based on the fault indicator, fault detection equipment with expensive FTU (fiber to the Unit) equivalent lattices does not need to be installed, complex operations such as offline and the like do not need to be carried out, and the cost is greatly reduced. By adopting the method of digraphization, the line structure is simplified, the incidence matrix is constructed, the fault section is determined by simple multiplication operation, a large amount of complex operation is not needed, and the efficiency is greatly improved.
The power distribution network fault positioning method based on the fault indicator utilizes the characteristic that the novel fault indicator can transmit fault information to install the fault indicator at a node element and judge the fault current direction so as to position the fault. The method only needs the fault indicator to transmit a small amount of fault information, and does not need to carry out high-precision data measurement.
A relatively accurate fault-tolerant mechanism is formulated by the fault indicator-based power distribution network fault positioning method, the mechanism can distinguish the conditions of single fault, multiple faults and normal operation of a line, and the occurrence of false alarm and failure of the fault indicator is avoided. The result proves that the method can more accurately locate the fault under the condition of single fault or multiple faults.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method for fault location of a power distribution network based on fault indicators;
FIG. 2 is a schematic diagram of a line segmentation;
FIG. 3 is a schematic illustration of a multiple fault schematic segment location;
FIG. 4 is a schematic diagram of fault location for path coincidence;
FIG. 5 is a schematic view of FI2 rejection;
FIG. 6 is a schematic diagram of a suburban distribution network system;
FIG. 7 is a simulation diagram of a single fault occurrence;
FIG. 8 is a single fault Simulik simulation;
FIG. 9 is a current waveform diagram;
FIG. 10 is a schematic diagram of a multiple fault line simulation;
FIG. 11 is a multi-fault Simulink simulation diagram;
FIG. 12 is a current waveform diagram;
Detailed Description
Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. I.e. these functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor means and/or microcontroller means.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations or operations have not been shown or described in detail to avoid obscuring aspects of the invention.
The invention provides a power distribution network fault positioning method based on a fault indicator, which comprises the following steps of:
the master station monitors the state of the power distribution network in real time and receives fault information;
the main station processes the fault information into current phasor;
acquiring a power supply section vector according to the current phasor, and determining a fault area;
carrying out inverse operation to obtain fault current phasor under a preset condition;
fault location fault tolerance analysis processing;
judging whether a fault occurs;
if the fault occurs, an alarm prompt is sent out, and a fault area and a fault point are displayed.
The method and the device of the invention can be implemented in many ways in a fault indicator based method for fault location of a power distribution network. For example, the methods and apparatus of the present invention may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order for the steps of the method is for illustrative purposes only, and the steps of the method of the present invention are not limited to the order specifically described above unless specifically indicated otherwise. Furthermore, in some embodiments, the present invention may also be embodied as a program recorded in a recording medium, the program including machine-readable instructions for implementing a method according to the present invention. Thus, the present invention also covers a recording medium storing a program for executing the method according to the present invention.
As an implementation mode of the embodiment of the invention, the power distribution network fault location design based on the fault indicator further comprises the following steps:
a fault location unit fault location method based on a fault indicator;
the current of the distribution network usually flows from a power supply to branches, so that the current can be represented by a phase tree, and the current flow is generally specified to be a positive direction. Fault indicators are typically installed at each node so that the line is segmented according to the location of the fault indicator. As shown in fig. 2, 4 fault indicators divide the line into 4 sections, section 1 is between FI1 and the other 3 fault indicators, section 2 is below FI2, section 3 is below FI3, and section 4 is below FI 4.
When a fault occurs in a line, fault current flows between a fault point and a power supply, a fault indicator acts to warn, other fault indicators do not act, the current value of the line through which the fault current flows is generally defined as 1, the current values of the other lines are generally defined as 0, as shown in the figure, if a fault occurs after FI2, FI1 and FI2 both act, the current value is 1, FI3 and FI4 do not act, the current value is 0, and the line current phasor under the condition is as follows:
ib＝[1 1 0 0]T (1-1)
the inflow current i of each node can be calculatedcIf the current value is 1, the fault occurs after the point, all lines between the next fault indicator without action are fault sections, and the current values of other lines in normal operation are 0. Obtaining fault section phasor:
ic＝[0 1 0 0]T (1-2)
from the above equation (1-2), it can be seen that a fault has occurred in section 2, and a fault has occurred in the line after FI 2.
As an embodiment of the present invention, a fault location multi-fault location method based on a fault indicator;
the specific method comprises the following steps: when multiple faults occur in the line, the fault location principle is the same as single fault location. As shown in fig. 3 and 4, with section 3 and section 4 failed, there was a fault current except for section 2, there was an action except for FI2, and the line fault current phasor:
ib＝[0 1 0 0]T (2-1)
substituting the phasor in the fault section:
ic＝[-1 0 1 1]T (2-2)
the phase-1 in the above equation indicates that the fault current is merged in section 1.
As an embodiment of the present invention, fault location fault tolerance analysis;
the specific method comprises the following steps: in the actual operation process, the fault indicator may be influenced by other factors such as the system to have a condition of refusing or false alarm, and the FI2 has a condition of refusing, so that the system can judge that the section behind the FI1 and the section behind the FI6 are fault sections, and the condition is a multi-fault condition.
Therefore, it is necessary to analyze the failure information. Firstly, judging a fault section according to fault information, then carrying out inverse operation, returning all numbers greater than or equal to 1, then comparing the numbers with the fault information, and analyzing the coincidence degree to reduce the probability of misjudgment. The judgment basis is as follows:
(1) a single fault indicator action is more prone to false positives, and multiple fault indicator actions are typically not misinformed.
(2) Generally, faults in the power distribution network are mostly single faults, and the situations of multiple faults are fewer.
The following is a method of fault tolerance correction
Firstly, calculating out phasor i in fault sectioncDetermining the fault section, calculating the fault current phasor i in the following by taking fig. 5 as an exampleb：
ib＝[1 0 0 0 1 1]T (3-1)
ic＝[1 -1 0 0 0 1]T (3-2)
icTwo of 1, then there may be 2n-1-3 fault cases, n being the number of 1. (a) FI1 post fault; (b) FI6 post fault; (b) both occur.
Introduction of new fault state phasor ickAt each ickThe middle fault section element value is 1, and the others are all 0.
As in (b), ic2Comprises the following steps:
ic2＝[0 0 0 0 0 1]T (3-3)
third, according to inverse calculation
Calculate i for all casesckThen i willbkPerforming a return-to-1 process, wherein k is 1, … 2n-1。
ic1Corresponding to ib1Comprises the following steps:
ib1＝[1 0 0 0 0 0]T (3-4)
ic2corresponding to ib2Comprises the following steps:
ib2＝[1 1 0 0 1 1]T (3-5)
ic3corresponding to ib3Comprises the following steps:
ib3＝[1 1 0 0 1 1]T (3-6)
fourthly, mixing ibkAnd reality ibIn comparison, the higher the similarity, the greater the likelihood.
Here, the similarity s needs to be defined:
s＝ib⊙ibk (3-7)
taking element sum in s as a similarity index, the larger f is, the higher the similarity is:
where n is the number of fault indicators.
In fig. 5, the similarity of the three cases is:
analysis shows that the two conditions (b) and (c) are more likely to occur, and the single fault is considered to be a single fault because the single fault is more likely to occur, and the actual condition is met after the fault section is FI 6.
As an embodiment of the invention, a suburban distribution network is taken as an embodiment of the method;
the specific method comprises the following steps: a power distribution network system in suburbs of a certain area is adopted, and as shown in figure 6, a 10kV power distribution network system is adopted, and 80 medium-voltage load distribution transformers of 10/0.4kV and 19 fault indicators are arranged in the network.
A schematic diagram of a suburban power distribution network system is built according to the method, and a simulation diagram is built through Multisim software. Fig. 7 is a simulation diagram of a single fault occurrence, and fig. 10 is a simulation diagram of a fault occurrence. Whether the fault indicator can quickly and accurately carry out fault positioning under different conditions is tested, and the result proves that the method can more accurately carry out fault positioning.
In the case of a single-fault simulation verification,
as shown in fig. 7, a fault point is provided on the line between FI15 and FI16, and all fault indicators between the fault point and the power supply are passed by fault current, thereby acting in full, and then transmitting fault information to the master station.
The position nodes of 19 fault indicators and the line structure are oriented to construct a node-branch incidence matrix Ab. Based on the behavior of these fault indicators, a fault information table 4-1 can be drawn.
The main station receives the information transmitted by the fault indicator, analyzes and processes the information, and then utilizes a plurality of fault positioning methods to position the fault section, and the fault current phasor i can be determined according to the fault positioning method provided by the textbFault line section phasor icThe element values of both. The analysis by the method of the invention can know that the fault section is FI 15.
TABLE 4-1 Single Fault information Table
2nOne, but possibly also a false indicator, is a 1-1 fault condition, so that (a) a fault occurs after FI 15; (b) a fault indicator false positive. Next, similarity calculation is performed, i for each caseckAnd ibkAs shown in formulas (4-1) and (4-2), calculating similarity index formula (4-3), and determining (a) isThe highest performance, namely the fault section is a line behind FI15, and the obtained conclusion is consistent with the actual situation.
ib1＝[1 1 1 1 0 0 0 0 0 0 0 1 1 0 1 0 0 0 0]T
(4-1)
ib2＝[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]T
(4-2)
Similarity:
the multi-fault simulation verification method comprises the following specific steps: as shown in fig. 10 to 12, 19 fault indicators were added. Fault 1 is placed in the line behind FI16 and fault 2 is placed in the line behind FI17, and the fault indicator detects that the fault current is all active.
Similar to single fault simulation, a node-branch incidence matrix A is also constructed according to a simulation schematic diagrambFault current flows from the power supply to the fault section and table 4-2 records fault information.
I is obtained by calculation analysisbAnd icSee table above. Analysis icIt is known that the fault section may be after FI16 and FI 16.
TABLE 4-2 multiple Fault information Table
22There are three fault conditions, so there are four possible conditions. (1) The failure point is after FI 16; (2) the failure point is after FI 17; (3) both FI16 and FI17 fail; (4) and no fault exists. Then, fault-tolerant analysis is carried out to calculate ibkAnd ickThe similarity comparison was performed as follows.
ib1＝[1 1 1 1 0 0 0 0 0 0 0 1 1 0 1 1 0 0 0]T
(4-4)
ib2＝[1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 1 0 0]T
(4-5)
ib3＝[1 1 1 1 1 1 0 0 0 0 0 1 1 0 1 1 1 0 0]T
(4-6)
ib4＝[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]T
(4-7)
The experimental simulation analysis shows that the fault location under the condition of single fault and multiple faults can be effectively carried out by the method.
According to the power distribution network fault positioning method based on the fault indicator, the fault detection equipment with expensive FTU (fiber to the Unit) and other equivalent grids is not required to be installed, complex operations such as network disconnection and the like are not required, and the cost is greatly reduced. By adopting the method of digraphization, the line structure is simplified, the incidence matrix is constructed, the fault section is determined by simple multiplication operation, a large amount of complex operation is not needed, and the efficiency is greatly improved.
The invention utilizes the characteristic that the novel fault indicator can transmit fault information, the fault indicator is arranged at the node element, and the fault current direction is judged, thereby carrying out fault positioning. The method only needs the fault indicator to transmit a small amount of fault information, and does not need to carry out high-precision data measurement.
The invention sets a relatively accurate fault-tolerant mechanism which can distinguish the conditions of single fault, multiple faults and normal operation of a line and avoid the occurrence of false alarm and failure of a fault indicator. The result proves that the method can more accurately locate the fault under the condition of single fault or multiple faults.
Based on the method, the invention also provides equipment for realizing the power distribution network fault positioning method based on the fault indicator, which comprises the following steps:
the storage is used for storing a computer program and a power distribution network fault positioning method based on the fault indicator;
and the processor is used for executing the computer program and the power distribution network fault location method based on the fault indicator so as to realize the steps of the power distribution network fault location method based on the fault indicator.
The invention also provides a storage medium with the fault indicator-based power distribution network fault location method, and the storage medium stores a computer program which is executed by a processor to realize the steps of the fault indicator-based power distribution network fault location method.
The apparatus implementing the fault indicator based power distribution network fault location method is the exemplary units and algorithm steps described in connection with the embodiments disclosed herein, which can be implemented in electronic hardware, computer software, or a combination of both, and the exemplary components and steps have been generally described in terms of functions in the foregoing description for clarity of illustration of interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
Through the above description of the embodiments, those skilled in the art will readily understand that the apparatus for implementing the fault indicator-based power distribution network fault location method described herein may be implemented by software, or may be implemented by software in combination with necessary hardware. Therefore, the technical solution according to the disclosed embodiment of the device for implementing the fault location method for the power distribution network based on the fault indicator may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a usb disk, a mobile hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which may be a personal computer, a server, a mobile terminal, or a network device, etc.) to execute the indexing method according to the disclosed embodiment.
The apparatus implementing the fault indicator based method for fault location of a power distribution network may write program code for performing the operations of the present disclosure in any combination of one or more programming languages, including an object oriented programming language such as Java, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device, or entirely on the remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computing device (e.g., through the internet using an internet service provider).
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A power distribution network fault positioning method based on a fault indicator is characterized by comprising the following steps:
the master station monitors the state of the power distribution network in real time and receives fault information;
the main station processes the fault information into current phasor;
acquiring a power supply section vector according to the current phasor, and determining a fault area;
carrying out inverse operation to obtain fault current phasor under a preset condition;
fault location fault tolerance analysis processing;
judging whether a fault occurs;
if the fault occurs, an alarm prompt is sent out, and a fault area and a fault point are displayed.
2. The fault indicator-based power distribution network fault location method of claim 1, wherein the method comprises:
configuring a power distribution network in a phase tree form, wherein the current flow direction is a positive direction;
installing a fault indicator at each node, and segmenting the line according to the position of the fault indicator;
when a fault occurs in the circuit, fault current flows between a fault point and a power supply, the fault indicator acts to warn, and the other fault indicators do not act;
the value of the line current through which the fault current flows is defined as 1, and the remaining line current values are defined as 0.
3. The fault indicator-based power distribution network fault location method according to claim 2, wherein the fault indicator-based fault location unit fault location method;
the method comprises the steps that 4 fault indicators are preset to divide a line into 4 sections, a section 1 is arranged between a node FI1 and other 3 fault indicators, a section 2 is arranged below a node FI2, a section 3 is arranged below a node FI3, and a section 4 is arranged below a node FI 4;
when a fault occurs after the node FI2, the node FI1 and the node FI2 both act, the current value is 1, the node FI3 and the node FI4 do not act, the current value is 0, and the line current phasor:
ib＝[1 1 0 0]T (1-1)
calculating the inflow current i of each nodecIf the current value is 1, this indicates thatAfter the point, a fault occurs, lines between the next fault indicator without action are fault sections, and the current values of other lines in normal operation are 0;
obtaining fault section phasor:
ic＝[0 1 0 0]T (1-2)
section 2 failed, indicating a failure of the line after node FI 2.
4. The fault indicator-based power distribution network fault location method according to claim 3, wherein the fault indicator-based fault location multi-fault location method;
when multiple faults occur in the line, section 3 and section 4 fail, there is a fault current except for section 2, there is an action except for node FI2, and the line fault current phasor:
ib＝[0 1 0 0]T (2-1)
substituting the phasor in the fault section:
ic＝[-1 0 1 1]T (2-2)
the phase-1 in the above equation indicates that the fault current is merged in section 1.
5. The fault indicator-based power distribution network fault location method of claim 3, wherein the fault location fault tolerance analysis process comprises:
judging a fault section according to the fault information, then performing inverse operation, returning all numbers greater than or equal to 1, comparing the numbers with the fault information, and analyzing the coincidence degree to reduce the probability of misjudgment;
the fault tolerance method comprises the following steps:
calculating out fault section phasor icDetermining fault section, calculating fault current phasor ib：
ib＝[1 0 0 0 1 1]T (3-1)
ic＝[1 -1 0 0 0 1]T (3-2)
icTwo of 1, then 2n1-3 kinds ofBarrier condition, n is the number of 1;
three fault state conditions are configured: (a) FI1 post fault; (b) FI6 post fault; (b) both occur;
preset fault state phasor ickAt each ickThe element value of the middle fault section is 1, and the others are 0;
when (b) occurs, ic2Comprises the following steps:
ic2＝[0 0 0 0 0 1]T (3-3)
third, according to inverse calculation
Calculate i for all casesckThen i willbkPerforming an in-1 treatment, wherein k is 1n-1；
ic1Corresponding to ib1Comprises the following steps:
ib1＝[1 0 0 0 0 0]T (3-4)
ic2corresponding to ib2Comprises the following steps:
ib2＝[1 1 0 0 1 1]T (3-5)
ic3corresponding to ib3Comprises the following steps:
ib3＝[1 1 0 0 1 1]T (3-6)
fourthly, mixing ibkAnd reality ibComparing, the higher the similarity is, the higher the possibility is;
defining the similarity s:
s＝ib⊙ibk (3-7)
taking element sum in s as a similarity index, the larger f is, the higher the similarity is:
wherein n is the number of fault indicators;
(a) FI1 post fault; (b) FI6 post fault; (b) the similarity of the three cases in which both occur is:
and judging the fault section according to the formula (3-9).
6. A device for realizing a fault location method of a power distribution network based on a fault indicator is characterized by comprising the following steps:
the storage is used for storing a computer program and a power distribution network fault positioning method based on the fault indicator;
a processor for executing the computer program and the fault indicator-based power distribution network fault location method to realize the steps of the fault indicator-based power distribution network fault location method according to any one of claims 1 to 5.
7. Storage medium with a fault indicator based method for fault location of a power distribution network, characterized in that the storage medium has stored thereon a computer program which is executed by a processor to carry out the steps of the fault indicator based method for fault location of a power distribution network according to any of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011240192.5A CN112485586A (en) | 2020-11-09 | 2020-11-09 | Power distribution network fault positioning method and equipment based on fault indicator and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011240192.5A CN112485586A (en) | 2020-11-09 | 2020-11-09 | Power distribution network fault positioning method and equipment based on fault indicator and storage medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112485586A true CN112485586A (en) | 2021-03-12 |
Family
ID=74928953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011240192.5A Pending CN112485586A (en) | 2020-11-09 | 2020-11-09 | Power distribution network fault positioning method and equipment based on fault indicator and storage medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112485586A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101551432A (en) * | 2009-05-07 | 2009-10-07 | 江苏省电力公司常州供电公司 | Power distribution network fault positioning method |
| CN104483601A (en) * | 2014-12-24 | 2015-04-01 | 广西大学 | Power distribution network fault location method based on fault indicators |
| CN106918764A (en) * | 2017-04-26 | 2017-07-04 | 云南电网有限责任公司瑞丽供电局 | Distribution Network Failure localization method based on net group moment formation algorithm |
| CN109412124A (en) * | 2018-12-04 | 2019-03-01 | 山东理工大学 | A kind of distribution line phase fault relaying configuration and setting method |
-
2020
- 2020-11-09 CN CN202011240192.5A patent/CN112485586A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101551432A (en) * | 2009-05-07 | 2009-10-07 | 江苏省电力公司常州供电公司 | Power distribution network fault positioning method |
| CN104483601A (en) * | 2014-12-24 | 2015-04-01 | 广西大学 | Power distribution network fault location method based on fault indicators |
| CN106918764A (en) * | 2017-04-26 | 2017-07-04 | 云南电网有限责任公司瑞丽供电局 | Distribution Network Failure localization method based on net group moment formation algorithm |
| CN109412124A (en) * | 2018-12-04 | 2019-03-01 | 山东理工大学 | A kind of distribution line phase fault relaying configuration and setting method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114915546B (en) | Power failure user positioning method, device, equipment and medium | |
| CN110048901B (en) | Fault positioning method, device and equipment for power communication network | |
| CN104750878A (en) | Mixed searching strategy-based topology fault diagnosis method | |
| EP4088380A1 (en) | Method and apparatus for recognizing operating state of photovoltaic string and storage medium | |
| Kundu et al. | Online identification of protection element failure using wide area measurements | |
| JP4556946B2 (en) | Tidal current calculation method and apparatus | |
| CN109946561A (en) | A kind of current transformer polarity testing method, apparatus, equipment and storage medium | |
| Mahmood et al. | Formal reliability analysis of protective systems in smart grids | |
| EP3012643B1 (en) | Method and apparatus for identifying causes for cable overcurrent | |
| CN116827263A (en) | Photovoltaic cell fault detection method, device, computer equipment and medium | |
| JP5111258B2 (en) | FAILURE LOCATION DEVICE, FAILURE LOCATION METHOD, AND FAILURE LOCATION PROGRAM | |
| Billinton | Basic models and methodologies for common mode and dependent transmission outage events | |
| CN112485586A (en) | Power distribution network fault positioning method and equipment based on fault indicator and storage medium | |
| JP5110946B2 (en) | FAILURE LOCATION DEVICE, FAILURE LOCATION METHOD, AND FAILURE LOCATION PROGRAM | |
| CN111429299B (en) | Method, system and storage medium for generating expected fault set | |
| Papic et al. | Overview of common mode outages in power systems | |
| CN115372752A (en) | Fault detection method, device, electronic equipment and storage medium | |
| CN113311220A (en) | Method, system, medium, and electronic device for diagnosing voltage sag | |
| CN109558258B (en) | Method and device for positioning root fault of distributed system | |
| CN107808240B (en) | Power grid risk scene fault probability calculation method and system | |
| JP5412563B2 (en) | FAILURE LOCATION DEVICE, FAILURE LOCATION METHOD, AND FAILURE LOCATION PROGRAM | |
| CN113702780B (en) | BP neural network-based high-voltage power supply online monitoring method and device | |
| CN117872037A (en) | Fault diagnosis method and device based on intelligent switch and power distribution network system | |
| CN117833174A (en) | Power distribution network line protection method, device, computer equipment and storage medium | |
| CN112001588A (en) | Accident event online pre-judging method and device based on N-1 state |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210312 |
|
| RJ01 | Rejection of invention patent application after publication |